Jiang Yaqi, Sun Yi, Zhang Peng, Zhou Pingfan, Wang Qibin, Zhu Guikai, Zhao Weichen, Li Yuanbo, Wang Quanlong, Rui Yukui
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.
Environ Sci Pollut Res Int. 2024 May;31(23):34368-34380. doi: 10.1007/s11356-024-33529-x. Epub 2024 May 4.
Manganese-based (Mn-based) nanomaterials (NMs) have great potential as alternatives to conventional Mn fertilizers. Yet, its environmental risks and effects on plant growth are not completely well understood. This study investigated the physiological effects of manganese dioxide (MnO) and manganese tetroxide (MnO) NMs on inter-root exposure (0-500 mg/L) of hydroponically grown rice. The results showed that on inter-root exposure, 50 mg/L Mn-based NMs promoted the uptake of mineral elements and enhanced the enzymatic activities of antioxidant systems (CAT and SOD) in rice, whereas 500 mg/L MnO NMs disrupted the mineral element homeostasis and led to phytotoxicity. The promotion effect of MnO NMs was better, firstly because MnO NMs treatment had lower Mn content in the plant than MnO NMs. In addition, MnO NMs are more transported and absorbed in the plant in ionic form, while MnO NMs exist in granular form. MnO NMs and MnO NMs both can be used as nano-fertilizers to improve the growth of rice by inter-root application, but the doses should be carefully selected.
锰基（Mn基）纳米材料（NMs）作为传统锰肥的替代品具有巨大潜力。然而，其环境风险以及对植物生长的影响尚未完全明晰。本研究调查了二氧化锰（MnO₂）和四氧化三锰（MnO₄）纳米材料对水培水稻根系间暴露（0 - 500毫克/升）的生理影响。结果表明，在根系间暴露时，50毫克/升的锰基纳米材料促进了水稻矿质元素的吸收，并增强了抗氧化系统（CAT和SOD）的酶活性，而500毫克/升的MnO₂纳米材料破坏了矿质元素稳态并导致植物毒性。MnO₂纳米材料的促进效果更好，首先是因为MnO₂纳米材料处理后植物中的锰含量低于MnO₄纳米材料。此外，MnO₂纳米材料在植物中更多以离子形式运输和吸收，而MnO₄纳米材料以颗粒形式存在。MnO₂纳米材料和MnO₄纳米材料都可通过根系间施用作为纳米肥料来促进水稻生长，但剂量应谨慎选择。
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